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Analog Devices Inc./Maxim Integrated MAX931CUA-T
- Part No.:
- MAX931CUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX931CUA-T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
The MAX931CUA-T from Maxim Integrated is a single micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output that sources up to 40mA and sinks ≥5mA, and operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply). It targets battery-powered threshold detection where ultra-low quiescent current (<4µA over temperature) and rail-to-rail input range (V− to V+ −1.3V) are critical.
For engineers reviewing the MAX931CUA-T datasheet, MAX931CUA-T pinout, MAX931CUA-T application, or MAX931CUA-T equivalent, key selection criteria include its 12µs propagation delay (10mV overdrive), internal reference accuracy, hysteresis configurability without external feedback, and compatibility with 3V/5V systems requiring stable low-power analog sensing.
Technical Context
The MAX931CUA-T integrates a precision 1.182V reference referenced to V− (not GND), enabling accurate threshold generation in single-supply configurations where V− = GND. Its unique output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and improving stability without mandatory bypassing.
Input common-mode range extends from V− to V+ −1.3V, supporting operation near the positive rail. Hysteresis is implemented via the HYST pin-accepting 1.182V to 1.132V-enabling simple two-resistor configuration for noise-immune switching without external op-amp feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; enables direct use in 3V and 5V battery systems without level-shifting. |
| Quiescent Current | <4µA over temperature; reduces battery drain in always-on monitoring circuits like smoke detectors or IoT sensors. |
| Reference Voltage | 1.182V ±2% (0°C to +70°C); provides stable trip point for precision threshold detection without external reference IC. |
| Propagation Delay | 12µs at 10mV overdrive; supports response-critical applications such as power-good assertion or fast fault detection. |
| Output Drive | Sources ≥40mA continuously; directly drives LEDs, small relays, or logic inputs without external buffers. |
| Input Common-Mode Range | V− to V+ −1.3V; allows sensing signals near V+ in single-supply systems (e.g., detecting battery voltage drop near full charge). |
| Reference Load Capability | Sinks 8µA / sources 15µA; supports driving modest hysteresis networks or low-leakage ADC reference dividers. |
Pinout & Package
MAX931CUA-T is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), rated for 0°C to +70°C operation. The µMAX footprint offers space savings over SO and DIP alternatives while maintaining thermal performance suitable for portable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for single-supply operation; connects to V− when using dual supplies. |
| 2 | V− | Negative supply terminal; tied to GND in single-supply mode; defines reference ground for REF output. |
| 3 | IN+ | Noninverting input; accepts signals from V− to V+ −1.3V; used for active-high threshold comparison. |
| 4 | IN− | Inverting input; same voltage range as IN+; forms differential pair with IN+ for standard comparator function. |
| 5 | HYST | Hysteresis control input; accepts 1.132V–1.182V to set hysteresis band; simplifies noise-immune design without feedback resistors. |
| 6 | REF | 1.182V ±2% reference output referenced to V−; powers HYST network and serves as precision threshold source. |
| 7 | V+ | Positive supply input; supports wide 2.5V–11V range; enables operation from coin cells to industrial rails. |
| 8 | OUT | Push-pull output; swings from V+ to GND; sources ≥40mA and sinks ≥5mA; drives TTL/CMOS loads directly. |
Key Features
| Feature | Design Value |
|---|---|
| No crowbar current during switching | Eliminates supply-line glitches and parasitic feedback, enabling stable operation without strict PCB layout constraints. |
| Programmable hysteresis via HYST pin | Enables precise, resistor-set hysteresis (up to 100mV band) without external op-amps or complex feedback networks. |
| Rail-to-rail input capability | Accepts inputs down to V− and up to V+ −1.3V, supporting full-range sensing in low-voltage battery monitoring. |
| High-current push-pull output | 40mA continuous source current allows direct LED driving or relay coil activation-reducing BOM count. |
| Low-noise reference interface | 1.182V ±2% reference with <1mVpp combined noise enables clean threshold generation in sensitive analog front-ends. |
Applications
| Battery-Powered Threshold Detector | Auto-Off Power Switch |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Comparator compares cell voltage against 1.182V reference scaled by resistor divider to detect <3.0V. Use Value: Ultra-low 4µA quiescent current extends shelf life of battery-backed devices; HYST pin adds noise margin without extra components. |
Use Scenario: Enabling timed shutdown of portable medical device after user inactivity. IC Role / Device Role / Timing Role: MAX931CUA-T controls MOSFET gate via RC-timed hysteresis circuit to assert power-off after ~90 seconds. Use Value: Integrated reference and hysteresis eliminate 3 external parts; 40mA output drives gate directly-no buffer needed. |
| LED Bar-Graph Level Gauge | Single-Supply Window Detector |
Use Scenario: Visualizing battery charge level with four LEDs on handheld test equipment. IC Role / Device Role / Timing Role: Four MAX931CUA-T units compare stepped divider voltages against 1.182V reference to light LEDs sequentially. Use Value: 40mA output drives LEDs at full brightness without current-limiting resistors; µMAX package saves board area. |
Use Scenario: Validating 5V supply integrity in embedded controller by detecting undervoltage (4.5V) and overvoltage (5.5V). IC Role / Device Role / Timing Role: Paired MAX931CUA-T units implement high/low thresholds using shared REF and HYST-configured hysteresis. Use Value: Internal reference ensures matched thresholds; HYST pin enables independent hysteresis tuning per threshold-no mismatch drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921CUA-T | 1% reference accuracy (vs. 2%), otherwise identical pinout, supply range, and output drive. | Better suited for precision voltage monitoring where ±10mV threshold error is unacceptable. | Select MAX921CUA-T when reference accuracy dominates system error budget; same layout and firmware. |
| TLV3011IDBVR | Lower quiescent current (1.2µA), no integrated reference, open-drain output, SOT-23-6 package. | Requires external reference and pull-up; better for ultra-low-power sleep-mode wake-up, not direct replacement. | Choose TLV3011IDBVR only when microamp-level supply current is paramount and reference can be sourced externally. |
Compared with MAX921CUA-T, the MAX931CUA-T trades reference accuracy for cost and availability, while TLV3011IDBVR reduces current but increases system complexity-making MAX931CUA-T optimal for cost-sensitive, self-contained threshold detection.
Availability
MAX931CUA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, oscillator circuits, and alarm circuits requiring stable component supply across commercial temperature range (0°C to +70°C) and long-term production continuity.
Supply support for MAX931CUA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on integration, low power, and reliability.
The MAX931CUA-T belongs to the MAX93x micropower comparator family, engineered specifically for ultra-low-power, single-supply sensing in portable and energy-constrained systems-combining reference, hysteresis, and robust output drive in one die.
FAQ
What is the operating temperature range for the MAX931CUA-T?
The MAX931CUA-T is specified for 0°C to +70°C (Commercial temperature range), as indicated by the "C" suffix in the part number. It uses the 8-pin µMAX package and is not rated for extended or automotive temperature ranges-those require MAX931ESA or MAX931EPA variants.
Can the MAX931CUA-T operate from a 3V supply?
Yes, the MAX931CUA-T operates from +2.5V to +11V single supply, making it fully compatible with 3V systems. At 3V, typical supply current remains below 4µA, and propagation delay increases slightly to ~14µs (10mV overdrive), per electrical characteristics tables in the datasheet.
How is hysteresis configured on the MAX931CUA-T?
Hysteresis is configured using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V− (GND in single-supply). The hysteresis band equals ~2×(VREF − VHYST), adjustable from 0 to 100mV. No external op-amp or feedback loop is required-unlike conventional comparators.
Does the MAX931CUA-T's reference output require bypassing?
No-the MAX931CUA-T's REF pin must not be bypassed. Capacitive loading degrades reference stability and increases noise. The internal bandgap reference is optimized for direct connection to the HYST pin or high-impedance divider networks; bypassing violates design specifications and risks output inaccuracy.
Is the MAX931CUA-T pin-compatible with the MAX921CUA-T?
Yes-the MAX931CUA-T and MAX921CUA-T share identical 8-pin µMAX pinout, supply ranges, and functional block diagram. They differ only in reference accuracy (2% vs. 1%) and minor electrical specs; no PCB or schematic changes are needed when upgrading from MAX931CUA-T to MAX921CUA-T.
MAX931CUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 0.015mA @ 5V
- Current - Output (Typ):
- 4µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX931CUA-T FAQ
1.How can I place an order for MAX931CUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX931CUA-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX931CUA-T reliable?
The price and inventory of MAX931CUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX931CUA-T is usually 5 days.
3.What payment methods are accepted for MAX931CUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX931CUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX931CUA-T?
MAX931CUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX931CUA-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX931CUA-T?
For technical support, including MAX931CUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX931CUA-T requirements.
6.How does Aetrix verify that MAX931CUA-T is sourced from the original manufacturer or authorized distributors?
All MAX931CUA-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX931CUA-T meets industry standards.
7.What is the process for return or replacement of MAX931CUA-T?
All MAX931CUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX931CUA-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX931CUA-T part is unused and in its original packaging.
Return procedure for MAX931CUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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